Typically, most apps don't want the volume button & slider to show by default in the media player so it is not present in this theme.

In most cases apps choose to either:
1) Leave it out entirely and rely on the Windows char bar and hardware volume buttons to facilitate this.
2) Add it to your app bar. To do this, you can add a little xaml to your app bar:

Hi Akash, I'm not sure I understand the question but if you're trying to wire up a separate instance of the Timeline control instead of default instance, you can add it to your Xaml page via something like this:

I didnt want to create a separate instance of the timeline. Instead i wanted to use the same timeline but the bubble which is available in timeline for entertainment theme to the default theme's timeline.

I wanted to add the bubble to the default mediaplayer frame work theme
Also find attached a file which would explain my doubt more clearly.